Simona Halep has received tributes from a host of her fellow tennis greats since she brought the curtain down on her ...

Some of the best players in ATP history have missed out on the world No 1 ranking - we rank nine of the greatest.

Few would have predicted that Halep would retire first, but that's precisely what has happened. Competing at the Cluj-Napoca event in her native Romania, Halep exited unexpectedly early and then made ...